/*
 moxl - Modular XML Library
 Copyright (c) 2007, Malcolm Sparks

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package moxl.xpath.parser.states.locationpath;

import moxl.tokenizer.Token;
import moxl.tokenizer.TokenStream;
import moxl.xpath.axes.XPathAxis;
import moxl.xpath.parser.XPathParser;
import moxl.xpath.parser.XPathParserException;
import moxl.xpath.parser.states.XPathParserState;
import moxl.xpath.parser.types.NonTerminal;
import moxl.xpath.parser.types.PathExpression;
import moxl.xpath.parser.types.Step;
import moxl.xpath.tokenizer.XPathTokenTypes;

public class XPathLocationPathExpectingStepSeparatorState extends XPathParserState
{
	private static XPathParserState instance = new XPathLocationPathExpectingStepSeparatorState();

	public static XPathParserState getInstance()
	{
		return instance;
	}

	@Override
	public void acceptOperator(XPathParser ctx, TokenStream tstream, Token token, NonTerminal nonTerminal) throws XPathParserException
	{
		if (token.getImage().startsWith("/"))
		{
			if (token.getImage().equals("/"))
			{
				Step step = ctx.begetParser().parseStepFromStream(tstream);
				PathExpression path = (PathExpression) nonTerminal;
				path.addStep(step);
			}
			else if (token.getImage().equals("//"))
			{
				Step step = ctx.begetParser().parseStepFromStreamWithImpliedAxis(tstream, XPathAxis.DESCENDANT);
				PathExpression path = (PathExpression) nonTerminal;
				path.addStep(step);
			}
			Token next = lookahead(tstream, 1);
			if (next != null && next.getType().equals(XPathTokenTypes.OPERATOR) && next.getImage().startsWith("/"))
			{
				// Keep state
			}
			else
			{
				ctx.changeState(XPathLocationPathEndState.getInstance());
			}
		}
		else
		{
			tstream.pushback(token);
			ctx.changeState(XPathLocationPathEndState.getInstance());
		}
	}

}
